Dome-shaped incandescent furnace.



F. BURGER & H. M. WILLIAMS.

DOME SHAPED INUANDESGBNT FURNACE.

APPLICATION FILED MAY 15. 1905.

928,404. Y Pa tented June 1, 1909.

' used in connection with a 'bOllGI, the object being to in which the products are consumed illustrated so i tributing it in the furnace,

venti UNITED STATES PATENT OFFICE.

FRANZ BURGERAND HENRY M. ivILLIAMs, or FORT WAYNE,'IN15IANA; ASSIGNOR or ONE-HALF or HIS RIGHT TO SAID WILLIAMS.

DQME-SHAPEED INGANDESGENT FURNACE.

Specification of Letters Patent.

Patented June '1, 1909.

Application filed May 15, 1905. Serial No. 260,503.

tion.

Our invention relates to improvements in what may roperly be termed incandescent furnaces w mh are preferably in a domeshaped'form and which areadapted to be similarlyshaped produce a furnace fuel is made incandescent without producing smoke and the combustion before leaving the fire-box, and to these ends our invention conslsts in a furnace embracing the various features of construction and arran ement of parts having the general mode 0 ation and producing tially forth.

In the accompanying drawings we have much of a furnace and boiler and attachments as is necessary toa clear understanding of our invention, in which Figure l is a vertical sectional view through the furnace, boiler and fuel and air operating devices some parts being shown in elevation. Fig. 2 is a detail show-' openas hereinafter more particularly set ing the grate operating devices, and Fig. 3

is another detail showing the levers which transmit reciprocating motion to the grate operating devices: I

- .As above intimated, one .of the objects of our invention is to provide a furnace wherein the fuel may be completely burned and the gases consumed so that the heat of the fuel may be utilized to the best ad'- vantage and the arts of the furnace'in operation be ren ere'cl' practically incanand air under pressure an furnace ma be of preferably dome-sha ed and isused with a boiler of similar s ape, and it is this;

- connelciion that we' will describe our inT without necessar' y limiting-it to the pr cise details or sha. shown.

In the accompanying di i wings E repreed Incandescent Fur-' the results substansents a metal jacket which constitutes the outer casing it is made dome-shaped as indicated. Within this casing and separated therefrom is.

SAID BURGER? of the furnace chamber, and

separated from the metal casing E'so as to leave a space for thepassage of the prodnets of combustion. B are united at their lower edges by the mud ring O, and below this mud ring the shells are provided with ports or passages for the products of combustion. Arranged within the ddine-shaped cavity in the bottom ofv the boiler there Is a domeshapedfire box 3 which is made of highly refractory material and which is provided near its top with a central opening 4. Below this opening and on the'insidev of the fire box 3 1s a-dome-shaped deflectin plate 5 of refractory material which is pre erably sup orted by brackets 6 formed'on the walls 3-0 the fire box. In the present instance the lower portions of the boiler, jacket and fire box are-shown as mounted upon a plate 9 which is suitabl supported by masonry 10, and beneath. t e plate is fastened the Thetwo shells A and air chamber or ash box 11-. It will be observed that since the fire box 3 is of substantially the same shape as the domeshaped cavity in the boiler formed by the inner shell B a passage will be formed between the firebox 3 and the shell B for the passage of products of-combustion.

The fire box is preferably provided w th a. revolving circular grate having rotating, grate-bars, such for instanceas 'shown more particularly in the application of F. Burger, Serial No. 245,772, filed Feby. 15th,19p5, to which reference is made .for the details of construction and arrangement; Furthermore the fire box is provided with a central fuel feeding tube indicated at 8 In'the present instance, to briefly describe the revolvlng grate,'it comprises a spider 70 havlng a central rim .71 bearing on a flange 39 onthe central feed tube, while its outer mm 72 may be suitably supported. in connection with the fire-box on the plate -9. This spider is provided with suitable means for revolving 1t and is shown with-a rack 73 on its under side.

.ing splrally arranged teeth 7 5, and these are Mounted on the spider in suitable v bearings are the rotating graterbars 74 havprovided with suitable means for rotating them, as fully set forth in the application above referred to, and, as indicated, by the pinions 76 mounted on the axles 77 of the grate-bars and engaging a rack 78 secured to the wall 3 of the furnace, so that when the;

. The shaft 16 of the fuel conveyer is provided at its outer end with a worm wheel-17 into which engages the worm 18 journaled in the boxes 19 which are bolted to the tube '8. On the worm shaft 18 is keyed the ratchet wheel 20, and loosely mounted on the shaft 18 is a lever 21 provided at its outer endwith a gravity pawl 22 engaging said ratchet wheel. The end of the lever 21 is connected by the rod 23 to the piston rod 24, and this is shown relatively large in diameter and operates inthe cylinder 25. As the power to operate the ratchet wheel 20 is only required mxone direction, very little power is necessary on the in-stroke, and therefore the piston rod.24 is purposely made relatively large.

The valves of the engine may in any suitable way, and we have shown the valve stem 27 as provided with two collars 28 adjustably mounted thereon and with an arm 26 connected to the piston rod 24 and adapted to impinge upon tliecollars to move the valves at the proper time in a well-'lmown manner.

. Asabove intimated, the grate is automaticallyfioperated step by step, and we have shown connected to the piston rod 24 a rod 24 connected to the lever 29 mounted on the shaft 30 working in bearings 31 bolted to the under side of the ash box 11;, I: The shaft 30 projects into the interior of the ash box and is provided with a slotted lever 32 which engages one end of the lever 33 fulcrumed on the air distributing box 34 ata-point- 35,'the upper end of which leveris; rovided with a gravitating pawl 36 adapte -to engage the ratchet toothed rim 73 on the under slde of the grate. 1

We have also shown means for supplying air to the fire box, and while the details of this may vary it consists of a blower 40, the

shaft of which is provided with a. fric ion roll 41 engaging a friction wheel 42 driven by an engine 43 mounted on the base plate 9, andleading from the blower is a duct or passage 44 efitending' to the annular chamber 34 located 1 the" ash box under the grate,

less furnace,

be operated and this air chamber is provided with a circular slot 45 through which the air escapes into the closed ash box and thence through the grate bars into the fire box.

From this description the operation Wlll be readily understood, and it will be seen that the fuel is introduced into the fire box through the tube 8, being continuously fed b sdi'ibed, and is distributed from the center of the grate toward the periphery thereof by means of the revolving grate and rotating grate-bars, and at the same time air under pressure is fed into the fire box, passmg through the fuel, so that the most complete combustion is attained. As a matter of fact the wall 3 and the deflecting crown plate 5 practically become incandescent, and the products of combustion pass up through the opening 4 and down around the walls of the fire box, between them and the inner domeshaped shell of the boiler, out through the passages D and up the outside of the boiler between thatand the jacket E, so that the, heat is fully utilized before it escapes to the outside air. In this way not'only is the fuel practically consumed so as to make a smoketure, and the whole provides an economical,

simple and eflicient furnace for the purposes intended.

It will be observed that the dome-shaped fire box adapts itself for the purposes mtended, especially in connection \with a simllarly shaped boiler arranged substantially as shown in connection with the fire box, and therefore We prefer to embody our invention in such a What we claim is 1. The combination with a dome-shaped fire box having a central opening at the top,

of a circular revoluble grate, means for supplying fuel through the central part of the grate, and a curved deflecting plate below the central opening in the fire-box. v

2. The combination with'a dome-shaped fire box having a central opening at the top, ofa circular grate, means 0 r revolving said grate, a central fuel feeding tube passing up through the grate, and a dome-shaped deflector-below"the central opening irrthe top of the fire box. I

means substantially such as that dea but the heat is utilized economically and is maintained-at an even temperageilerally shaped. furnace and boiler.

3. The combmation with a dome-shaped fire box having a central opening at the top, of a grate at the bottom of said fire box, a

fuel inlet passing through said grate, means for sup lyin fuel through said inlet, and

a curve de ecting plate below the central opening at the top-of the fire box so ar-' ranged as to deflect laterally the gases arising from the green fuel at the said inlet, and to commingle them with the air passing through the grate.

4. The combination with a dome-shaped fire box having a central opening at thetop'; In testimony whereof we have signed our of a circular revoluble grate, means for supnames to this specification in the presence of plying fuel through the central part of the two subscribing Witnesses.

grate, and a deflecting plate concave on its FRANZ BURGER- under surface above said inlet whereby the hydrocarbon gases from the l green 'fuel at HENRY T WILLIAMS the inlet are deflected laterally and, down- \Vitnesses: wardly and intermingled with the air pass- GEO. K. TORRENCE,

ing through the grate. H. W. DI'GKMAN. 

